65134240 has 48 divisors (see below), whose sum is σ = 157648680. Its totient is φ = 25415680.

The previous prime is 65134231. The next prime is 65134243. The reversal of 65134240 is 4243156.

It can be written as a sum of positive squares in 4 ways, for example, as 25040016 + 40094224 = 5004^2 + 6332^2 .

It is not an unprimeable number, because it can be changed into a prime (65134243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1596 + ... + 11524.

Almost surely, 2^65134240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65134240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78824340).

65134240 is an abundant number, since it is smaller than the sum of its proper divisors (92514440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65134240 is a wasteful number, since it uses less digits than its factorization.

65134240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9985 (or 9977 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 65134240 is about 8070.5786657463. The cubic root of 65134240 is about 402.3491764166.

Adding to 65134240 its reverse (4243156), we get a palindrome (69377396).

The spelling of 65134240 in words is "sixty-five million, one hundred thirty-four thousand, two hundred forty".